CN106786557B - Extra-high voltage layered direct current capacity and drop point selection method and system - Google Patents
Extra-high voltage layered direct current capacity and drop point selection method and system Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The invention relates to a method and a system for selecting extra-high voltage layered direct current capacity and drop points, comprising the following steps: determining a preliminary position of the extra-high voltage layered direct current accessed into a 1000kV power grid; preliminarily selecting a preliminary position of the extra-high voltage layered direct current access 500kV power grid; selecting an extra-high voltage layered direct current transmission capacity; calculating the short-circuit capacity and the effective short-circuit ratio of a bus of the 500kV transformer substation under the condition that the extra-high voltage layered direct current does not fall; judging whether the effective short-circuit ratio meets the requirement or not, and forming a first scheme set of preliminary selection of the drop points of the ultra-high voltage layered direct current access 500kV power grid; judging whether the effective short-circuit ratio in the scheme set I meets the requirement or not, and forming an extra-high voltage layered direct current access 500kV power grid drop point preliminary selection scheme set II; forming a plurality of extra-high voltage layered direct current access 500kV power grid alternative schemes according to the scheme set II; screening a reasonable scheme of ultra-high voltage layered direct current access 500kV power grid; and recommending a final extra-high voltage layered direct current capacity and drop point scheme. The invention simplifies the extra-high voltage layered direct current capacity and the drop point selection process, and effectively reduces the workload.
Description
Technical Field
The invention relates to the field of safety and stability analysis of power systems, in particular to a method and a system for selecting extra-high voltage layered direct current capacity and drop points.
Background
The power grid in China is currently formed into a North China-China alternating current interconnected power grid, and the North China power grid operates in a solitary network and is connected with the North China-China power grid through a direct current system. According to the planning, tens of extra-high voltage direct current projects are built in China for the next 10-20 years, an extra-high voltage alternating current-direct current series-parallel power grid is gradually formed, and power is supplied to a middle east load center through an extra-high voltage direct current system. In order to solve the problems of insufficient voltage reactive support capability of a receiving end power grid, short-circuit current line crossing caused by dense sending-out systems and the like of a multi-feed-in direct current system, the extra-high voltage layered direct current becomes a new direct current access mode. Compared with the conventional extra-high voltage direct current, the method is mainly characterized in that the high-end converter transformer and the low-end converter transformer at the inversion side are respectively connected with 500kV and 1000kV power grids, and the alternating current filter and the reactive compensation device are also respectively connected with the 500kV and 1000kV power grids.
At present, an extra-high voltage layered direct current capacity and a drop point selection method mainly still adopt an engineering experience method, and firstly, the power deficiency level of a receiving end power grid is evaluated, and the direct current capacity is selected according to the power deficiency level; then, preliminarily giving a plurality of groups of 500kV outlet schemes according to the 500kV power grid structure of the receiving end power grid; secondly, carrying out short-circuit current calculation, power flow distribution calculation and safe and stable calculation on each scheme; and comprehensively evaluating each scheme, and selecting a more reasonable scheme. Overall, the existing selection method for extra-high voltage layered direct current capacity and drop points is still rough, and the regularity and the systematicness are relatively insufficient. And along with the rapid development of the power grid, the trend direction, the short-circuit current level, the safety and stability characteristics and the like can be greatly changed, the extra-high voltage layered direct current capacity and the drop point are selected only by means of local experience, and the method is difficult to adapt to the short-term and medium-long-term comprehensive requirements of the complex change of the power grid.
Therefore, in the face of the acceleration construction of the ultra-high voltage power grid and the rapidly-increased load demand of the provincial power grid, the technical problems of the ultra-high voltage layered direct current capacity, the optimal selection of the drop points and the like are needed to be solved.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide the extra-high voltage layered direct current capacity and the drop point selection method and the system, the extra-high voltage layered direct current transmission capacity is determined through the extra-high voltage layer line and the transformer transmission limit constraint, and the scheme of reasonably screening extra-high voltage layered direct current to be connected into a 500kV power grid through the 500kV power grid short circuit ratio evaluation is adopted, so that the extra-high voltage layered direct current capacity and the drop point selection process are greatly simplified, and the workload is effectively reduced.
The invention aims at adopting the following technical scheme:
the invention provides an extra-high voltage layered direct current capacity and drop point selection method, which is improved in that the method comprises the following steps:
step one: according to the construction condition of the extra-high voltage alternating current transformer substation, the extra-high voltage alternating current transformer substation is the primary position of the extra-high voltage layered direct current access 1000kV power grid;
step two: determining the active power shortage of a power grid in a 500kV region through power and electric quantity balance analysis, and combining the result of the step one, namely preliminarily selecting a 500kV transformer substation positioned near the extra-high voltage alternating current transformer substation as a preliminary position of the extra-high voltage layered direct current access 500kV power grid;
step three: calculating extra-high voltage layered direct current access 1000kV power grid capacity P constrained by extra-high voltage main transformer capacity and 1000kV transformer substation line in-out transmission limit DC-1000 Further selecting the extra-high voltage layered direct current transmission capacity;
step four: under the condition of calculating extra-high voltage layering direct current non-drop points, the short-circuit capacity and the effective short-circuit ratio ESCR of each 500kV transformer substation bus DC ；
Step five: determining effective short-circuit ratio ESCR DC Whether the requirements are met or not, and forming a first scheme set of preliminary selection of the drop points of the ultra-high voltage layered direct current access 500kV power grid;
step six: effective short circuit ratio ESCR in judgment scheme set DC Whether the requirements are met or not, and forming an extra-high voltage layered direct current access 500kV power grid drop point preliminary selection scheme set II;
step seven: forming a plurality of extra-high voltage layered direct current access 500kV power grid alternative schemes according to the scheme set II;
step eight: screening a plurality of extra-high voltage layered direct current access 500kV power grid alternative schemes formed in the step seven;
step nine: and (3) recommending a final extra-high voltage layered direct current capacity and drop point scheme by combining the step three and the step eight.
Further, in the third step, the extra-high voltage layered direct current is accessed into the 1000kV power grid capacity P DC-1000 Calculated by the following formula (1):
P DC-1000 ＝P AC-send +P Trans -P AC-rec (1)
extra-high voltage layered DC total capacity P DC The method comprises the following steps:
P DC ＝2*P DC-1000 (2)
in the method, in the process of the invention,P Trans is full ofExtra-high voltage transformer substation with enough transformer N-1 fault requirements allows maximum downward power, N is the number of transformers of the extra-high voltage transformer substation, S N Rated apparent power for a single extra-high voltage transformer, < > for>For the power factor of the transformer, 0.95 is selected, k is the short-time allowable overload coefficient of the transformer, and 1.3 is selected; p (P) AC-send Stable limit power of circuit for ultra-high voltage transformer substation, P AC-rec The stable quota power of the incoming line of the ultra-high voltage transformer substation is obtained; />Representing the power factor angle.
Further, in the fourth step, the effective short circuit ratio ESCR DC Calculated by formula (3):
wherein: q (Q) dc Filter capacitor capacity configured for extra-high voltage DC inversion station, S dc The short-circuit capacity of the extra-high voltage direct current converter bus is P dN Is the rated power of the extra-high voltage direct current.
Further, in the fifth step, the effective short circuit ratio ESCR DC The judgment principle meeting the requirements is as follows: effective short-circuit ratio ESCR DC > 2.5 to meet the requirements; otherwise, the requirements are not satisfied;
if the effective short circuit ratio ESCR DC If the requirement is met, the 500kV transformer substation is used as one of the drop point choices; if the effective short circuit ratio ESCR DC If the requirements are not met, the 500kV transformer substation cannot be used as a drop point for selection, and all the 500kV transformer substations meeting the requirements form an extra-high voltage layered direct current access 500kV power grid drop point primary selection scheme set one.
Further, in the sixth step, the effective short circuit ratio ESCR DC The judgment principle meeting the requirements is as follows: effective short-circuit ratio ESCR DC > 2.5 to meet the requirements; otherwise, the requirements are not satisfied;
calculating the effective short-circuit ratio after the fault of any return line N-1 of the 500kV transformer substation in the scheme set I; if the effective short circuit ratio ESCR DC If the requirement is met, the 500kV transformer substation is used as one of the drop point choices; if the effective short circuit ratio ESCR DC If the requirements are not met, the 500kV transformer substation cannot be selected as a drop point; and forming an extra-high voltage layered direct current access 500kV power grid drop point preliminary selection scheme set II by using one scheme set and all 500kV substations meeting the requirements.
Further, in the seventh step, the principle of forming the alternative scheme of the extra-high voltage layered direct current access 500kV power grid is as follows: if the capacity of the extra-high voltage layered direct current access 500kV power grid is 4000MW, 2 500kV double-loop back outlet channels are constructed; if the capacity of the extra-high voltage layered direct current access 500kV power grid is 5000-6000MW, 3 500kV double-loop back outlet channels are constructed.
In the eighth step, the extra-high voltage layered direct current with the effective short circuit ratio more than 2.5 and the system stability and the wireless circuit power hotter and the limit power stable is screened to be accessed into the 500kV power grid scheme through the effective short circuit ratio calculation and the safety and stability check (such as three-permanent N-1, three-permanent N-2 faults and the like) after the extra-high voltage layered direct current drop point.
The invention also provides a system for selecting the extra-high voltage layered direct current capacity and the drop point, which is improved in that the system comprises:
preliminary position determination module of 1000kV electric wire netting: according to the construction condition of the extra-high voltage alternating current transformer substation, the method is used for determining the primary position of the extra-high voltage layered direct current access 1000kV power grid;
preliminary position determination module of 500kV electric wire netting: the method comprises the steps of determining the active power shortage of a power grid in a 500kV region through power and electric quantity balance analysis, and combining the result of the step one, namely preliminarily selecting a 500kV transformer substation positioned near an extra-high voltage alternating-current transformer substation as a preliminary position of the extra-high voltage layered direct-current access 500kV power grid;
the extra-high voltage layered direct current transmission capacity selection module comprises: extra-high voltage layered direct current access 1000kV power grid capacity P constrained by transmission limits of extra-high voltage main transformer capacity and 1000kV transformer substation in-out line DC-1000 Thereby selecting extra-highVoltage-stratification direct current transmission capacity;
the calculation module: under the condition of calculating extra-high voltage layering direct current non-drop points, the short-circuit capacity and the effective short-circuit ratio ESCR of each 500kV transformer substation bus DC ；
Scheme set one selection module: for determining effective short-circuit ratio ESCR DC Whether the requirements are met or not, and forming a first scheme set of preliminary selection of the drop points of the ultra-high voltage layered direct current access 500kV power grid;
scheme set two selection module: effective short circuit ratio ESCR in judgment scheme set DC Whether the requirements are met or not, and forming an extra-high voltage layered direct current access 500kV power grid drop point preliminary selection scheme set II;
500kV power grid alternative forming module: according to the scheme set II, a plurality of extra-high voltage layered direct current access 500kV power grid alternative schemes are formed;
and a screening module: the multiple extra-high voltage layered direct current access 500kV power grid alternative schemes are used for screening the step seven;
and a final scheme recommendation module: and combining the third step and the eighth step, and recommending a final extra-high voltage layered direct current capacity and drop point scheme.
Further, the scheme set one selection module is further configured to:
effective short-circuit ratio ESCR DC The judgment principle meeting the requirements is as follows: effective short-circuit ratio ESCR DC > 2.5 to meet the requirements; otherwise, the requirements are not satisfied;
if the effective short circuit ratio ESCR DC If the requirement is met, the 500kV transformer substation is used as one of the drop point choices; if the effective short circuit ratio ESCR DC If the requirements are not met, the 500kV transformer substation cannot be used as a drop point for selection, and all the 500kV transformer substations meeting the requirements form an extra-high voltage layered direct current access 500kV power grid drop point primary selection scheme set one.
Further, the scheme set two selection module is further configured to: effective short-circuit ratio ESCR DC The judgment principle meeting the requirements is as follows: effective short-circuit ratio ESCR DC > 2.5 to meet the requirements; otherwise, the requirements are not satisfied;
any loop of 500kV transformer substation in calculation scheme setEffective short circuit ratio after the failure of the path N-1; if the effective short circuit ratio ESCR DC If the requirement is met, the 500kV transformer substation is used as one of the drop point choices; if the effective short circuit ratio ESCR DC If the requirements are not met, the 500kV transformer substation cannot be selected as a drop point; and forming an extra-high voltage layered direct current access 500kV power grid drop point preliminary selection scheme set II by using one scheme set and all 500kV substations meeting the requirements.
Compared with the closest prior art, the technical scheme provided by the invention has the following excellent effects:
according to the extra-high voltage layered direct current capacity and drop point selection method and system provided by the invention, the extra-high voltage layered direct current transmission capacity is determined through the extra-high voltage layer line and the transformer transmission limit constraint, and a scheme of reasonably selecting extra-high voltage layered direct current to be connected into a 500kV power grid through 500kV power grid short circuit ratio evaluation and screening is adopted, so that the extra-high voltage layered direct current capacity and drop point selection process is greatly simplified, and the workload is effectively reduced. Compared with other methods, the method has simple and clear physical meaning, greatly reduces unnecessary calculation and analysis, has clear directivity, and can quickly determine reasonable extra-high voltage layered direct current capacity and drop point schemes. The practical result shows that the invention solves the technical problems of ultra-high voltage layering DC capacity, optimized selection of drop points and the like
To the accomplishment of the foregoing and related ends, the one or more embodiments comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative aspects and are indicative of but a few of the various ways in which the principles of the various embodiments may be employed. Other benefits and novel features will become apparent from the following detailed description when considered in conjunction with the drawings, the disclosed embodiments are intended to include all such aspects and their equivalents.
Drawings
FIG. 1 is a flow chart of the extra-high voltage layered DC capacity and drop point selection method provided by the invention;
FIG. 2 is a grid plan view of a Henan grid after commissioning of a Reinforcement project of Changnan Jing according to an embodiment of the present invention;
FIG. 3 is a diagram showing a line stability limit after a long south line N-1 according to a first embodiment of the present invention;
FIG. 4 is a graph of river-filial active power according to one embodiment of the present invention;
fig. 5 is a diagram of a network frame structure of an extra-high voltage layered dc access alternative according to a first embodiment of the present invention;
fig. 6 is a schematic diagram of power of the remaining lines after the state hal-nanyang line N-1 according to the first embodiment provided by the present invention;
fig. 7 is a schematic diagram of power of the remaining lines after the state hal-nanyang line N-1 according to the first embodiment provided by the present invention;
fig. 8 is a schematic diagram of power of the remaining line after the N-1 line of the hawk-Xi Xian line according to the first embodiment of the present invention;
fig. 9 is a schematic diagram of power of the remaining lines after the N-2 ha- ar line according to the first embodiment of the present invention;
fig. 10 is a schematic diagram of power of the remaining lines after the state hal-nanyang line N-2 according to the first embodiment provided by the present invention;
fig. 11 is a schematic diagram of power of the rest of the line N-2 after the state hal-Xi Xian line provided by the present invention.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the drawings.
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may involve structural, logical, electrical, process, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. These embodiments of the invention may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed.
The invention provides an extra-high voltage layered direct current capacity and drop point selection method, a flow chart of which is shown in figure 1, comprising the following steps:
step one: determining a preliminary position of the extra-high voltage layered direct current accessed to the 1000kV power grid according to the construction condition of the extra-high voltage alternating current transformer substation;
step two: determining the active power shortage of the power grid in the 500kV region through power and electric quantity balance analysis, and preliminarily selecting the preliminary position of the extra-high voltage layered direct current access 500kV power grid according to the result of the step one;
step three: calculating the capacity of the extra-high voltage layered direct current access 1000kV power grid constrained by the transmission limit of the extra-high voltage main transformer capacity and the in-out line of the 1000kV transformer substation, and further selecting the extra-high voltage layered direct current transmission capacity;
in the third step, extra-high voltage layered direct current is accessed into 1000kV power grid capacity P DC-1000 Calculated by formula (1):
P DC-1000 ＝P AC - send +P Trans -P AC-rec (1)
extra-high voltage layered DC total capacity P DC The method comprises the following steps:
P DC ＝2*P DC-1000 (2)
in the method, in the process of the invention,P Trans in order to meet the maximum allowable lower-injection power of an extra-high voltage transformer substation required by N-1 faults of the transformer, N is the number of transformers of the extra-high voltage transformer substation, S N Rated apparent power for a single extra-high voltage transformer, < > for>For the power factor of the transformer, 0.95 is generally selected, k is a short-time allowable overload coefficient of the transformer, and 1.3 is generally selected. P (P) AC-send Stability of outgoing line for the extra-high voltage substationQuota rating, P AC-rec And the stability quota of the incoming line of the extra-high voltage transformer substation is obtained.
Step four: calculating the short-circuit capacity and the effective short-circuit ratio of each 500kV transformer substation bus under the condition that the extra-high voltage layered direct current does not fall;
in step four, the effective short-circuiting ratio ESCR DC Calculated by formula (3):
wherein Q is dc Filter capacitor capacity configured for extra-high voltage DC inversion station, S dc The short-circuit capacity of the extra-high voltage direct current converter bus is P dN Is the rated power of the extra-high voltage direct current.
Step five: if the effective short-circuit ratio meets the requirement, the 500kV transformer substation can be used as one of the drop points; if the effective short-circuit ratio does not meet the requirement, the 500kV transformer substation cannot be selected as a drop point; forming a first scheme set of preliminary selection of the drop points of the ultra-high voltage layered direct current access 500kV power grid;
step six: calculating the effective short-circuit ratio after the fault of any return line N-1 of the 500kV transformer substation in the scheme set I; if the effective short-circuit ratio meets the requirement, the 500kV transformer substation can be used as one of the drop points; if the effective short-circuit ratio does not meet the requirement, the 500kV transformer substation cannot be selected as a drop point; forming an extra-high voltage layered direct current access 500kV power grid drop point preliminary selection scheme set II;
in the fifth and sixth steps, the effective short circuit ratio ESCR DC The requirements of (2) are as follows: ESCR (ESCR) DC > 2.5 is satisfactory, otherwise is unsatisfactory.
Step seven: forming a plurality of extra-high voltage layered direct current access 500kV power grid alternative schemes according to the scheme set II;
in the seventh step, the principle of alternative formation is as follows: if the capacity of the extra-high voltage layered direct current access 500kV power grid is 4000MW, 2 500kV double-loop back outlet channels are generally considered to be constructed; if the capacity of the extra-high voltage layered direct current access 500kV power grid is 5000-6000MW, 3 500kV double-loop back outlet channels are generally considered to be constructed.
Step eight: the multiple alternative schemes formed in the step seven are calculated and checked safely and stably through the effective short-circuit ratio after the extra-high voltage layered direct current falling point, and the scheme of the most reasonable extra-high voltage layered direct current access 500kV power grid is screened;
step nine: and (3) recommending a final extra-high voltage layered direct current capacity and drop point scheme by combining the step three and the step eight.
Example 1
Based on the same inventive concept, the invention also provides an extra-high voltage layered direct current capacity and drop point selection system, which is characterized in that the system comprises:
preliminary position determination module of 1000kV electric wire netting: according to the construction condition of the extra-high voltage alternating current transformer substation, the method is used for determining the primary position of the extra-high voltage layered direct current access 1000kV power grid;
preliminary position determination module of 500kV electric wire netting: the method comprises the steps of determining the active power shortage of a power grid in a 500kV region through power and electric quantity balance analysis, and combining the result of the step one, namely preliminarily selecting a 500kV transformer substation positioned near an extra-high voltage alternating-current transformer substation as a preliminary position of the extra-high voltage layered direct-current access 500kV power grid;
the extra-high voltage layered direct current transmission capacity selection module comprises: extra-high voltage layered direct current access 1000kV power grid capacity P constrained by transmission limits of extra-high voltage main transformer capacity and 1000kV transformer substation in-out line DC-1000 Further selecting the extra-high voltage layered direct current transmission capacity;
the calculation module: under the condition of calculating extra-high voltage layering direct current non-drop points, the short-circuit capacity and the effective short-circuit ratio ESCR of each 500kV transformer substation bus DC ；
Scheme set one selection module: for determining effective short-circuit ratio ESCR DC Whether the requirements are met or not, and forming a first scheme set of preliminary selection of the drop points of the ultra-high voltage layered direct current access 500kV power grid;
scheme set two selection module: effective short circuit ratio ESCR in judgment scheme set DC Whether the requirements are met or not, and forming an extra-high voltage layered direct current access 500kV power grid drop point preliminary selection scheme set II;
500kV power grid alternative forming module: according to the scheme set II, a plurality of extra-high voltage layered direct current access 500kV power grid alternative schemes are formed;
and a screening module: the multiple extra-high voltage layered direct current access 500kV power grid alternative schemes are used for screening the step seven;
and a final scheme recommendation module: and combining the third step and the eighth step, and recommending a final extra-high voltage layered direct current capacity and drop point scheme.
9. The extra-high voltage hierarchical dc capacity and drop point selection system of claim 8, wherein said scheme set one selection module is further configured to:
effective short-circuit ratio ESCR DC The judgment principle meeting the requirements is as follows: effective short-circuit ratio ESCR DC > 2.5 to meet the requirements; otherwise, the requirements are not satisfied;
if the effective short circuit ratio ESCR DC If the requirement is met, the 500kV transformer substation is used as one of the drop point choices; if the effective short circuit ratio ESCR DC If the requirements are not met, the 500kV transformer substation cannot be used as a drop point for selection, and all the 500kV transformer substations meeting the requirements form an extra-high voltage layered direct current access 500kV power grid drop point primary selection scheme set one.
10. The extra-high voltage hierarchical dc capacity and drop point selection system of claim 8 wherein said set two selection module is further configured to: effective short-circuit ratio ESCR DC The judgment principle meeting the requirements is as follows: effective short-circuit ratio ESCR DC > 2.5 to meet the requirements; otherwise, the requirements are not satisfied;
calculating the effective short-circuit ratio after the fault of any return line N-1 of the 500kV transformer substation in the scheme set I; if the effective short circuit ratio ESCR DC If the requirement is met, the 500kV transformer substation is used as one of the drop point choices; if the effective short circuit ratio ESCR DC If the requirements are not met, the 500kV transformer substation cannot be selected as a drop point; and forming an extra-high voltage layered direct current access 500kV power grid drop point preliminary selection scheme set II by using one scheme set and all 500kV substations meeting the requirements.
Example two
Taking Henan electric network planning net rack after strengthening engineering operation as an example, the net rack diagram is shown in figure 2, and Henan electric network as an example, the effectiveness of the proposed method is verified.
Step one: according to the construction condition of an extra-high voltage alternating-current transformer substation, a river south power grid has a south-to-south extra-high voltage transformer, after the project is put into operation in a reinforcing way of a long-south wattage, the extra-high voltage south-to-south transformer is considered to be a south-to-north reciprocal hub, an extra-high voltage grid structure and line tide distribution are combined, and the extra-high voltage south-to-south transformer is initially selected to serve as a drop point of the extra-high voltage layered access 1000kV power grid;
step two: through electric power and electric quantity balance analysis, active power deficiency exists in a Yuan area, and a step one ultra-high voltage power grid construction plan is combined, and the landing points of 500kV Nanyang, an, pu, xi Xian, white river, yudu and river layered direct current access to the 500kV power grid are preliminarily selected;
step three: calculating extra-high voltage layered DC capacity P DC-1000 ；
P DC-1000 ＝P AC-send +P Trans -P AC-rec
Planning the number of the extra-high voltage main transformer to be 4
In the southbound mode, the stability limit after the southbound N-1 is 8000MW, i.e. P AC-rec =8000 MW, the long south line remaining two loops of line power is shown in fig. 3.
The thermal stability limit of the section of the relaxed jaw is 4700MW, namely P AC-send =4700 MW. At this time, the river-filial double loop power is 2450MW, and the river-filial II line active power after N-1 is 1950MW, as shown in FIG. 4.
Then P DC-1000 ＝P AC-send +P Trans -P AC-rec ＝4700+11115-8000＝7815
The existing layered direct current engineering is 8000MW, 10000MW and 12000MW, the capacity should be selected as large as possible to meet the power demand of the receiving end, and margin is reserved for the extra-high voltage main transformer and the line, so P DC-1000 ＝12000/2＝6000MW。
Extra-high voltage layering straightTotal capacity of flow P DC The method comprises the following steps:
P DC ＝2*P DC-1000 ＝2*6000＝12000MW
step four: under the condition of calculating extra-high voltage layering direct current non-falling point, Q is taken dc The bus bar short-circuit capacity and the effective short-circuit ratio of each 500kV transformer substation are shown in Table 1 for 3600 MVar.
TABLE 1 bus short-circuit current, short-circuit capacity and effective short-circuit ratio of 500kV substations respectively
| Bus name | Short-circuit current (kA) | Short circuit capacity (MW) | Effective short-circuit ratio |
| Nanyang | 56.49 | 51367.15 | 7.96 |
| White River | 55.56 | 50518.41 | 7.82 |
| Yudu (Chinese character) | 41.71 | 37929.78 | 5.72 |
| A | 40.06 | 36430.35 | 5.47 |
| river | 35.10 | 31914.23 | 4.72 |
| Xi Xian | 34.15 | 31053.30 | 4.58 |
Step five: checking that the effective short circuits of the buses of the transformer substations in the table 1 are all larger than 2.5, meeting the requirement, and forming a scheme set of 500kV Nanyang, baihe, Mr, yudu, He and Xi Xian.
Step six: the effective short-circuit ratio after any 500kV line fault of each transformer substation is calculated, and the results are shown in tables 2-7.
TABLE 2 effective short-circuiting ratio after Nanyang-to-Loop faults
| Disconnecting the line | Short-circuit current (kA) | Short circuit capacity (MW) | Effective short-circuit ratio |
| Nanyang-Yudu | 53.46 | 48610.64 | 7.50 |
| Nanyang-Baihe | 53.17 | 48351.18 | 7.46 |
| Nanyang-Xiangshan | 52.14 | 47415.14 | 7.30 |
| Nanyang- air intake | 51.41 | 46748.28 | 7.19 |
TABLE 3 effective short-circuiting ratio after white river to first circuit line failure
Table 4 effective short-circuiting ratio after a line fault
| Disconnecting the line | Short-circuit current (kA) | Short circuit capacity (MW) | Effective short-circuit ratio |
| , zhou Wan | 37.45 | 34054.57 | 5.08 |
| Be used as an agent for making a new-type of food | 37.38 | 33991.22 | 5.07 |
| , river- | 36.66 | 33331.57 | 4.96 |
| A-Nanyang | 34.24 | 31130.71 | 4.59 |
TABLE 5 effective short-circuiting ratio after Zeta changes to circuit line fault
| Disconnecting the line | Short-circuit current (kA) | Short circuitCapacity (MW) | Effective short-circuit ratio |
| Yudu-ultramarine | 40.54 | 36862.78 | 5.54 |
| Yudu-Baihe | 36.32 | 33024.26 | 4.90 |
| Yudu-Nanyang | 34.81 | 31650.67 | 4.68 |
Table 6 effective short-circuiting ratio after river-to-loop line fault
| Disconnecting the line | Short-circuit current (kA) | Short circuit capacity (MW) | Effective short-circuit ratio |
| He-Hua Yu | 39.55 | 35961.59 | 5.39 |
| He-Chunsheng | 35.03 | 31850.77 | 4.71 |
| river- air pump | 30.86 | 28065.47 | 4.08 |
| river-filial sense | 30.40 | 27641.97 | 4.01 |
TABLE 7 effective short-circuiting ratio after a Saxian to Loop failure
In the scheme set I, the effective short-circuit ratio after all the 500kV transformer substations N-1 is larger than 2.5, the requirements are met, and the scheme set II is formed by 500kV Nanyang, white river, air, yudu, river and Xi Xian.
Step seven: according to the third step, the capacity of the extra-high voltage layered direct current access 500kV power grid is 6000MW, and 3 500kV double-loop back outlet channels are generally considered to be constructed. And (3) according to a scheme set II formed in the step five, sequentially analyzing each 500kV transformer substation.
(1) Considering that layered extra-high voltage direct current 1000kV is connected to the side of an extra-high voltage south-to-1000 kV bus, and 500kV drop points are close to the extra-high voltage south-to-south, the 500kV south-to-south is selected as an alternative station;
(2) Considering that the short-circuit current of the 500kV white river station is higher, if the extra-high voltage direct current is connected, the short-circuit current is further improved, and the 500kV white river station is not recommended to be used as an alternative station;
(3) Considering that the large power supply of the interior village is connected to the Yudu station after passing through the group English station, if the large power supply is used as an extra-high voltage direct current drop point, the extra-high voltage direct current injection power is mutually restricted with the power generation power of the power plant of the interior village, and the large power supply is not recommended to be used as an alternative station;
(4) Considering that the southeast of the Yuan lacks electricity, an air pump and a river can select one station as an alternative station, the existing line from Nanyang to an air pump runs, considering that an extra-high voltage direct current falling point pi is accessed to the line, and recommending 500kV air pump to be changed as an alternative station;
(5) After the extra-high voltage direct current landing point Xi Xian is considered, the capacity of a short circuit of a Chi can be improved, the Yu-Hubei section is reinforced, and 500kV Xi Xian is recommended to be used as an alternative station.
In summary, the recommended scheme is that the extra-high voltage layered direct current passes through 500kV double-circuit line drop points of 500kV Nanyang, 500kV and 500kV Xi Xian, and the formed alternative scheme is shown in FIG. 5
The short-circuit current, short-circuit capacity and effective short-circuit ratio of each 500kV busbar in scheme set 2 after layering extra-high voltage direct current access are calculated, and the results are shown in Table 8
TABLE 8 bus short-circuit current, short-circuit capacity and effective short-circuit ratio of 500kV substations respectively
| Bus name | Short-circuit current (kA) | Short circuit capacity (MW) | Effective short-circuit ratio |
| Nanyang | 53.05 | 48242.09 | 7.44 |
| White River | 50.61 | 46024.37 | 7.07 |
| A | 44.05 | 40051.90 | 6.08 |
| Xi Xian | 40.25 | 36600.10 | 5.50 |
| Yudu (Chinese character) | 36.75 | 33413.38 | 4.97 |
| river | 35.53 | 32310.34 | 4.79 |
Step eight: and (5) safety and stability checking.
After the national hawk- takes the air of line N-1, the remaining line power is shown in FIG. 6.
After the state harect-nanyang line N-1, the remaining line power is shown in fig. 7.
After the state hal-Xi Xian line N-1, the remaining line power is shown in FIG. 8.
After the national hawk- takes the air of line N-2, the remaining line power is shown in FIG. 9.
After the state harect-nanyang line N-2, the remaining line power is shown in fig. 10.
After the state hal-Xi Xian line N-2, the remaining line power is shown in fig. 11.
As can be seen from the figures 6-11, after the ultra-high voltage layered direct current 500kV outgoing lines N-1 and N-2 are failed, the system is stable, the rest lines do not exceed the thermal stability limit, and the power flow distribution is uniform.
Step nine: the proposal is recommended by combining the step three and the step eight.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, one skilled in the art may make modifications and equivalents to the specific embodiments of the present invention, and any modifications and equivalents not departing from the spirit and scope of the present invention are within the scope of the claims of the present invention.
Claims (3)
1. The extra-high voltage layered direct current capacity and drop point selection method is characterized by comprising the following steps of:
step one: according to the construction condition of the extra-high voltage alternating current transformer substation, the extra-high voltage alternating current transformer substation is the primary position of the extra-high voltage layered direct current access 1000kV power grid;
step two: determining the active power shortage of a power grid in a 500kV region through power and electric quantity balance analysis, and combining the result of the step one, namely preliminarily selecting a 500kV transformer substation positioned near the extra-high voltage alternating current transformer substation as a preliminary position of the extra-high voltage layered direct current access 500kV power grid;
step three: calculating extra-high voltage layered direct current access 1000kV power grid capacity P constrained by extra-high voltage main transformer capacity and 1000kV transformer substation line in-out transmission limit DC-1000 Further selecting the extra-high voltage layered direct current transmission capacity;
in the third step, extra-high voltage layered direct current is accessed into 1000kV power grid capacity P DC-1000 Calculated by the following formula (1):
P DC-1000 ＝P AC-send +P Trans -P AC-rec (1)
extra-high voltage layered DC total capacity P DC The method comprises the following steps:
P DC ＝2*P DC-1000 (2)
in the method, in the process of the invention,P Trans in order to meet the maximum allowable lower-injection power of the extra-high voltage transformer substation required by N-1 faults of the transformers, N is the number of the transformers of the extra-high voltage transformer substation, S N Rated apparent power for a single extra-high voltage transformer, < > for>For the power factor of the transformer, 0.95 is selected, k is the short-time allowable overload coefficient of the transformer, and 1.3 is selected; p (P) AC-send Stable limit power of circuit for ultra-high voltage transformer substation, P AC-rec The stable quota power of the incoming line of the ultra-high voltage transformer substation is obtained; />Representing a power factor angle;
step four: under the condition of calculating extra-high voltage layering direct current non-drop points, the short-circuit capacity and the effective short-circuit ratio ESCE of each bus of 500kV transformer substation DC ；
Step five: determining effective short-circuit ratio ESCR DC Whether the requirements are met or not, and forming a first scheme set of preliminary selection of the drop points of the ultra-high voltage layered direct current access 500kV power grid;
in the fifth step, the effective short circuit ratio ESCR DC The judgment principle meeting the requirements is as follows: effective short-circuit ratio ESCR DC > 2.5 to meet the requirements; otherwise, the requirements are not satisfied;
if the effective short circuit ratio ESCR DC If the requirement is met, the 500kV transformer substation is used as one of the drop point choices; if the effective short circuit ratio ESCR DC If the requirements are not met, the 500kV transformer substation cannot be used as a drop point for selection, and all the 500kV transformer substations meeting the requirements form an extra-high voltage layered direct current to be connected into a 500kV power grid drop point primary selection scheme set one;
step six: judgment methodEffective short-circuit ratio ESCR in case one DC Whether the requirements are met or not, and forming an extra-high voltage layered direct current access 500kV power grid drop point preliminary selection scheme set II;
in the sixth step, the effective short-circuit ratio ESCR DC The judgment principle meeting the requirements is as follows: effective short-circuit ratio ESCR DC > 2.5 to meet the requirements; otherwise, the requirements are not satisfied;
calculating the effective short-circuit ratio after the fault of any return line N-1 of the 500kV transformer substation in the scheme set I; if the effective short circuit ratio ESCR DC If the requirement is met, the 500kV transformer substation is used as one of the drop point choices; if the effective short circuit ratio ESCR DC If the requirements are not met, the 500kV transformer substation cannot be selected as a drop point; forming an extra-high voltage layered direct current access 500kV power grid drop point primary selection scheme set II by using one scheme set and all 500kV substations meeting the requirements;
step seven: forming a plurality of extra-high voltage layered direct current access 500kV power grid alternative schemes according to the scheme set II;
in the seventh step, the principle of forming an alternative scheme of the extra-high voltage layered direct current access 500kV power grid is as follows: if the capacity of the extra-high voltage layered direct current access 500kV power grid is 4000MW, 2 500kV double-loop back outlet channels are constructed; if the capacity of the extra-high voltage layered direct current access 500kV power grid is 5000-6000MW, 3 500kV double-loop back outlet channels are constructed;
step eight: screening a plurality of extra-high voltage layered direct current access 500kV power grid alternative schemes formed in the step seven;
in the eighth step, the extra-high voltage layered direct current with the effective short circuit ratio more than 2.5 and the system stable and the wireless road power hotter and the limit power stable after the three-permanent N-1 and the three-permanent N-2 have faults is screened to be accessed into a 500kV power grid scheme through the calculation of the effective short circuit ratio after the extra-high voltage layered direct current falls point and the safety and stability check;
step nine: and (3) recommending a final extra-high voltage layered direct current capacity and drop point scheme by combining the step three and the step eight.
2. The extra-high voltage hierarchical DC capacity and drop point selection method according to claim 1 wherein in said step four, the effective short circuit ratio ESCR DC Calculated by formula (3):
wherein: q (Q) dc Filter capacitor capacity configured for extra-high voltage DC inversion station, S dc The short-circuit capacity of the extra-high voltage direct current converter bus is P dN Is the rated power of the extra-high voltage direct current.
3. An extra-high voltage layered dc capacity and drop point selection system, the system comprising:
preliminary position determination module of 1000kV electric wire netting: according to the construction condition of the extra-high voltage alternating current transformer substation, the method is used for determining the primary position of the extra-high voltage layered direct current access 1000kV power grid;
preliminary position determination module of 500kV electric wire netting: the method comprises the steps of determining the active power shortage of a power grid in a 500kV region through power and electric quantity balance analysis, and combining the result of the step one, namely preliminarily selecting a 500kV transformer substation positioned near an extra-high voltage alternating-current transformer substation as a preliminary position of the extra-high voltage layered direct-current access 500kV power grid;
the extra-high voltage layered direct current transmission capacity selection module comprises: extra-high voltage layered direct current access 1000kV power grid capacity P constrained by transmission limits of extra-high voltage main transformer capacity and 1000kV transformer substation in-out line DC-1000 Further selecting the extra-high voltage layered direct current transmission capacity;
the calculation module: under the condition of calculating extra-high voltage layering direct current non-drop points, the short-circuit capacity and the effective short-circuit ratio ESCR of each 500kV transformer substation bus DC ；
In the calculation module, extra-high voltage layered direct current is accessed into 1000kV power grid capacity P DC-1000 Calculated by the following formula (1):
P DC-1000 ＝P AC-send +P Trans -P AC-rec (1)
extra-high voltage layered DC total capacity P DC The method comprises the following steps:
P DC ＝2*P DC-1000 (2)
in the method, in the process of the invention,P Trans in order to meet the maximum allowable lower-injection power of the extra-high voltage transformer substation required by N-1 faults of the transformers, N is the number of the transformers of the extra-high voltage transformer substation, S N Rated apparent power for a single extra-high voltage transformer, < > for>For the power factor of the transformer, 0.95 is selected, k is the short-time allowable overload coefficient of the transformer, and 1.3 is selected; p (P) AC-send Stable limit power of circuit for ultra-high voltage transformer substation, P AC-rec The stable quota power of the incoming line of the ultra-high voltage transformer substation is obtained; />Representing a power factor angle;
scheme set one selection module: for determining effective short-circuit ratio ESCR DC Whether the requirements are met or not, and forming a first scheme set of preliminary selection of the drop points of the ultra-high voltage layered direct current access 500kV power grid;
the scheme set one selection module is further configured to:
effective short-circuit ratio ESCR DC The judgment principle meeting the requirements is as follows: effective short-circuit ratio ESCR DC > 2.5 to meet the requirements; otherwise, the requirements are not satisfied;
if the effective short circuit ratio ESCR DC If the requirement is met, the 500kV transformer substation is used as one of the drop point choices; if the effective short circuit ratio ESCR DC If the requirements are not met, the 500kV transformer substation cannot be used as a drop point for selection, and all the 500kV transformer substations meeting the requirements form an extra-high voltage layered direct current to be connected into a 500kV power grid drop point primary selection scheme set one;
scheme set two selection module: effective short circuit ratio ESCR in judgment scheme set DC Whether the requirements are met or not, and forming an extra-high voltage layered direct current access 500kV power grid drop point preliminary selection scheme set II;
the scheme setThe two selected modules are also used for: effective short-circuit ratio ESCR DC The judgment principle meeting the requirements is as follows: effective short-circuit ratio ESCR DC > 2.5 to meet the requirements; otherwise, the requirements are not satisfied;
calculating the effective short-circuit ratio after the fault of any return line N-1 of the 500kV transformer substation in the scheme set I; if the effective short circuit ratio ESCR DC If the requirement is met, the 500kV transformer substation is used as one of the drop point choices; if the effective short circuit ratio ESCR DC If the requirements are not met, the 500kV transformer substation cannot be selected as a drop point; forming an extra-high voltage layered direct current access 500kV power grid drop point primary selection scheme set II by using one scheme set and all 500kV substations meeting the requirements;
500kV power grid alternative forming module: according to the scheme set II, a plurality of extra-high voltage layered direct current access 500kV power grid alternative schemes are formed;
in the step 500kV power grid alternative forming module, the principle of forming the extra-high voltage layered direct current access 500kV power grid alternative is as follows: if the capacity of the extra-high voltage layered direct current access 500kV power grid is 4000MW, 2 500kV double-loop back outlet channels are constructed; if the capacity of the extra-high voltage layered direct current access 500kV power grid is 5000-6000MW, 3 500kV double-loop back outlet channels are constructed;
and a screening module: the multiple extra-high voltage layered direct current access 500kV power grid alternative schemes are used for screening the step seven;
in the step, the extra-high voltage layered direct current with the effective short circuit ratio more than 2.5 and the system stability and the wireless path power hotter and the limit power stability after the three-permanent N-1 and the three-permanent N-2 faults are screened through the effective short circuit ratio calculation and the safety and stability check after the extra-high voltage layered direct current falls point to be accessed into a 500kV power grid scheme;
and a final scheme recommendation module: and combining the third step and the eighth step, and recommending a final extra-high voltage layered direct current capacity and drop point scheme.
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| CN107798427B (en) * | 2017-10-17 | 2021-08-17 | 国家电网公司 | Construction method of extra-high voltage power transmission grid structure scheme of large-scale energy base |
| CN107959288B (en) * | 2017-12-07 | 2020-07-17 | 国网山东省电力公司经济技术研究院 | Receiving-end extra-high voltage grid double-stage optimization method |
| CN108233435B (en) * | 2017-12-26 | 2020-07-28 | 华中科技大学 | Quantitative evaluation index system and comprehensive evaluation method for extra-high voltage access mode |
| CN108418255B (en) * | 2018-03-01 | 2021-09-28 | 中国电力科学研究院有限公司 | Planning method and system suitable for extra-high voltage direct current outgoing power grid containing high-permeability new energy |
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